CN113404617B

CN113404617B - Non-contact driven adjustable cavitation venturi

Info

Publication number: CN113404617B
Application number: CN202110841744.6A
Authority: CN
Inventors: 蔡国飙; 田辉; 谭广; 张源俊; 陈瑞凯; 卢裕东
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2022-05-06
Anticipated expiration: 2041-07-26
Also published as: CN113404617A

Abstract

The application relates to the technical field of aerospace, in particular to a non-contact driven adjustable cavitation venturi, which comprises a driving coil assembly, a moving mechanism and a venturi body; wherein, the venturi body is provided with a flow passage with variable sectional area; the driving coil assembly is arranged on one side of the venturi body and connected with the venturi body, and a first static sealing component is arranged between the driving coil assembly and the venturi body; the driving coil assembly is provided with a circulation channel communicated with the venturi body and an external installation cavity; the moving mechanism is arranged in the mounting cavity, and part of the moving mechanism can be driven by the electromagnetic of the driving coil assembly to move along the flow passage of the venturi body so as to change the flow cross-sectional area. Therefore, the driving mode of the venturi belongs to non-contact driving, and static sealing is adopted, so that the sealing performance is improved, and leakage is avoided.

Description

Non-contact driven adjustable cavitation venturi

Technical Field

The application relates to the technical field of aerospace, in particular to a non-contact driven adjustable cavitation venturi.

Background

The general adjustable venturi tube 4' is a flow passage which is contracted firstly and then expanded, the flow cross section area at the minimum position of the throat part is a circular cross section, and the minimum flow cross section area at the throat part is adjusted through the mutual matching of the movable valve core, the contraction section, the throat part and the expansion section, so that the purpose of adjusting the flow is achieved.

As shown in fig. 1, in order to effectively drive the valve plug, that is, the needle cone 2 ' to move along the flow channel of the venturi 4 ', the adjustable cavitation venturi generally needs to be driven by using a linear motor 1 ' or a linear module, that is, the valve plug is fixedly connected with a driving part. In this contact drive, it is necessary to prevent fluid leakage by the seal ring 3 ', and since the needle cone 2' is a moving member, a movable seal is formed at a connection portion between the seal ring 3 'and the needle cone 2', and leakage is likely to occur in a limited environment such as a high temperature environment and a low temperature environment, and a small leakage amount of a corrosive medium causes a great potential safety hazard.

Disclosure of Invention

The application aims to provide a non-contact driven adjustable cavitation venturi, and solves the technical problem that the sealing performance of the traditional motor-driven valve core in the prior art is poor to a certain extent.

The application provides a non-contact driven adjustable cavitation venturi, includes: the driving coil assembly, the moving mechanism and the venturi body; wherein the venturi body is formed with a flow passage having a variable sectional area;

the driving coil assembly is arranged on one side of the venturi body and is connected with the venturi body, and a first static sealing component is arranged between the driving coil assembly and the venturi body;

the driving coil assembly is provided with a circulation channel communicated with the venturi body and an external installation cavity; the moving component is arranged in the mounting cavity, and part of the moving component can be driven by the electromagnetic of the driving coil component to move along the flow channel of the venturi body so as to change the flow cross-sectional area;

the driving coil assembly comprises an inlet mounting shell, a middle mounting shell and a coil; one end of the middle mounting shell is connected with the inlet mounting shell, and the other opposite end of the middle mounting shell is connected with the venturi body;

the coil is sleeved outside the middle mounting shell, and two opposite side parts of the coil are respectively abutted against the inlet mounting shell and the venturi body;

the moving mechanism comprises a nose cone member, a moving sleeve and a moving assembly; wherein a portion of the nose cone member is captured between the inlet mounting housing and the mid-mounting housing; the shifting sleeve is formed with a receiving cavity, and the part of the nose cone member and the shifting assembly are arranged in the receiving cavity;

the moving assembly is in sliding connection with the nose cone member;

the moving component and the nose cone component are enclosed to form a liquid accumulation cavity, and a flow guide channel for communicating the liquid accumulation cavity with a flow channel of the venturi body is formed in the moving component.

In the above technical solution, further, a second static sealing member is disposed between one end of the middle mounting housing and the inlet mounting housing, and the first static sealing member is disposed between the other end of the middle mounting housing opposite to the venturi body.

In any of the above technical solutions, further, two opposite ends of the middle installation housing are respectively connected with the inlet installation housing and the venturi bodies, which are in one-to-one correspondence, through threads.

In any of the above technical solutions, further, a dynamic sealing member is disposed between the moving assembly and the nose cone member.

In any of the above technical solutions, further, a first limit balancing component is disposed between the moving sleeve and the inlet mounting housing, and a second limit balancing component is disposed between the moving component and the venturi tube body, and is configured to limit the moving component forward and backward in the moving direction.

In any of the above technical solutions, further, the first position-limiting balancing assembly includes a position-limiting member and a first elastic member, the position-limiting member is clamped in a partial structure of the nose cone member, the first elastic member is sleeved at one end of the movable sleeve, and two opposite ends of the first elastic member respectively abut against the position-limiting member and a first position-limiting portion formed by the movable sleeve;

the second limiting balance assembly comprises a second elastic component, the second elastic component is sleeved at the other end of the movable sleeve, and the two opposite ends of the second elastic component are respectively abutted against the venturi body and a second limiting part formed by the movable sleeve.

In any of the above technical solutions, further, the moving assembly includes a balance conducting member and a needle cone member connected to each other, and a connecting member is clamped between the balance conducting member and the needle cone member, and the connecting member is further connected to the moving sleeve; the limiting component is clamped on the nose cone component;

the head cone component is provided with the dropsy cavity, the flow guide channel comprises a first flow guide channel and a second flow guide channel which are communicated, the first flow guide channel is formed on the balance conducting component, and the second flow guide channel is formed on the needle cone component; the dropsy cavity, the first flow guide channel and the second flow guide channel are communicated in sequence;

the balance conducting member is inserted into an installation cavity in the nose cone member and is connected with the nose cone member in a sliding manner; the end part of the balance conducting component and the nose cone component enclose into the liquid accumulation cavity; the dynamic sealing component is arranged between the balance conducting component and the nose cone component.

In any one of the above technical solutions, further, a first step groove is formed between the balance conducting member and the awl member;

the connecting component comprises a connecting installation ring part and a connecting part, and the installation ring part is sleeved outside the balance conduction component and clamped in the first stepped groove;

the top of the connecting part, which is far away from the mounting ring part, is connected with the inner wall of the movable sleeve;

the connecting portion has a fin-like structure.

In any of the above technical solutions, further, the nose cone member includes a nose cone main body, a first auxiliary mounting portion, and a clamping portion; the nose cone main body is provided with a cylindrical shell structure with a conical head; the first auxiliary mounting part is provided with a fin-shaped structure;

the first auxiliary mounting part is arranged on the outer wall surface of the nose cone main body, the clamping part is arranged on the top of the first auxiliary mounting part far away from the nose cone main body, a second step groove is formed between the clamping part and the first auxiliary mounting part, and the limiting component is clamped in the second step groove;

the clamping part and the limiting component are clamped between the inlet mounting shell and the middle mounting shell;

the flow passage of the inlet mounting housing for receiving the nose cone member is adapted to the external shape of the nose cone member.

And/or

The needle cone component comprises a body and a variable part which are connected; wherein the body is connected with the balance conduction component through threads; the variable portion has a tapered structure that tapers toward the venturi body.

In any of the above aspects, further, the nose cone member and the moving assembly are formed from a soft magnetic alloy.

In any of the above technical solutions, further, the non-contact driven adjustable cavitation venturi further includes a controller and a flow sensor, the flow sensor is disposed on a pipeline connected to the venturi body, and the flow sensor and the coil are both in communication connection with the controller.

In any of the above technical solutions, further, the venturi body includes an installation housing portion and a flow guide portion, the installation housing portion is connected with the middle installation housing;

the first static sealing component is arranged between the mounting shell part and the middle mounting shell;

the water conservancy diversion portion is formed with the circulation passageway, the circulation passageway is including the contraction section, the parallel section of needle awl and the expansion section that set up in order.

Compared with the prior art, the beneficial effect of this application is:

the non-contact driven adjustable cavitation venturi tube utilizes the driving coil component to drive the moving mechanism to move along the flow channel of the venturi tube body, further changes the flow cross section, realizes the adjustment of the flow cross section, and further adjusts the flow, belongs to a non-contact driving mode, and therefore a first static sealing component is arranged between the driving coil component and the venturi tube body, the sealing requirement can be met, and compared with the traditional dynamic sealing structure, the sealing performance is improved.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a prior art adjustable cavitation venturi configuration;

FIG. 2 is a schematic structural diagram of a non-contact driven adjustable cavitation venturi according to an embodiment of the present application;

FIG. 3 is a cross-sectional view of a non-contact driven adjustable cavitation venturi provided in accordance with an embodiment of the present application;

FIG. 4 is a schematic diagram of a portion of a non-contact driven adjustable cavitation venturi according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a moving assembly according to an embodiment of the present application.

Reference numerals:

1 '-linear motor, 2' -needle cone, 3 '-sealing ring and 4' -venturi tube;

1-drive coil assembly, 11-inlet mounting housing, 12-middle mounting housing, 13-coil, 14-plug socket;

2-moving mechanism, 21-nose cone member, 211-nose cone main body, 212-first auxiliary mounting part, 213-clamping part, 214-dropsy cavity, 22-moving sleeve, 221-annular step, 23-moving assembly, 231-balance conducting member, 2312-first flow guide channel, 232-needle cone member, 2321-body, 2322-variable part, 2323-second flow guide channel, 233-connecting member, 2331-mounting ring part, 2332-connecting part, 24-limiting member, 25-first elastic member, 26-second elastic member and 27-dynamic sealing member;

3-venturi body, 31-installation shell part, 32-flow guiding part, 321-contraction section, 322-needle cone parallel section, 323-expansion section, 4-first static sealing component and 5-second static sealing component.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.

The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.

All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

A non-contact driven adjustable cavitation venturi according to some embodiments of the present application is described below with reference to fig. 2-5.

Referring to fig. 2 and 3, embodiments of the present application provide a non-contact driven adjustable cavitation venturi comprising: the driving coil component 1, the moving mechanism 2 and the venturi body 3; wherein, the venturi body 3 is formed with a flow passage with a variable sectional area;

the driving coil component 1 is arranged on one side of the venturi body 3 and is connected with the venturi body 3, and a first static sealing component 4 is arranged between the driving coil component 1 and the venturi body 3;

the driving coil component 1 is provided with a circulation channel communicated with the Venturi body 3 and an external installation cavity; the moving component 23 is arranged in the mounting cavity, and part of the moving component 23 can be driven by the electromagnetic of the driving coil component 1 to move along the flow passage of the venturi body 3 so as to change the flow cross-sectional area.

It can be seen that, the adjustable cavitation venturi tube driven in a non-contact way utilizes the driving coil component 1 to drive the moving mechanism 2 to move along the flow passage of the venturi body 3, so as to change the flow cross section, realize the adjustment of the flow cross section, and further adjust the flow, and belongs to a non-contact driving way, therefore, a first static sealing component 4 is arranged between the driving coil component 1 and the venturi body 3, so that the sealing requirement can be met, and compared with the previous dynamic sealing structure, the sealing performance is improved.

In one embodiment of the present application, preferably, as shown in fig. 2 and 3, the driving coil assembly 1 includes an inlet mounting case 11, a middle mounting case 12, and a coil 13;

wherein, one end of the middle mounting shell 12 is connected with the inlet mounting shell 11 and a second static sealing component 5 is arranged between the two, the other opposite end of the middle mounting shell 12 is connected with the venturi body 3 and a first static sealing component 4 is arranged between the two;

the coil 13 is sleeved outside the middle mounting shell 12, opposite two side portions of the coil 13 respectively abut against the inlet mounting shell 11 and the venturi tube body 3, the coil 13 is used for generating an electromagnetic field, moving components such as a moving assembly 23 and the like which are described below are subjected to electromagnetic force through the electromagnetic field to generate displacement, the larger the current passing through the coil 13 is, the larger the magnetic field intensity of the electromagnetic field is, the larger the electromagnetic force is subjected to by the moving components such as the moving assembly 23 and the like, and it is noted that the coil 13 is further provided with a plug seat 14 for connecting a power supply.

In this embodiment, static seal members are disposed at the assembly positions of the middle mounting housing 12, the inlet mounting housing 11 and the venturi body 3, so as to further improve the sealing effect.

Wherein, the inlet mounting housing 11 and the middle mounting housing 12 are both preferably hollow and open at both ends.

In one embodiment of the present application, as shown in fig. 3, preferably, the opposite ends of the middle mounting housing 12 are respectively connected with the inlet mounting housings 11 and the venturi bodies 3 corresponding to each other through threads, and it can be seen that a detachable connection mode is adopted, so that the assembly and disassembly are more convenient, and the later operation and maintenance are further facilitated.

In one embodiment of the present application, preferably, as shown in fig. 2 to 4, the shifting mechanism 2 includes a nose cone member 21, a shifting sleeve 22, and a shifting assembly 23;

wherein, the part of the nose cone member 21 is limited between the inlet mounting housing 11 and the middle mounting housing 12, which plays a role of fixing the nose cone member 21 to keep it in a stationary state.

The traveling sleeve 22 is formed with a receiving cavity in which portions of the nose cone member 21 and the traveling assembly 23 are disposed.

The moving assembly 23 is slidably connected with the nose cone member 21, and a dynamic sealing member 27 is disposed between the moving assembly 23 and the nose cone member 21, so as to further avoid head leakage, that is, to prevent the liquid in the front end of the nose cone member 21, that is, the inlet mounting housing 11, from flowing into the liquid accumulation cavity 214.

The moving component 23 and the conical component 21 are enclosed into a liquid accumulation cavity 214, the moving component 23 is also provided with a flow guide channel which is communicated with the liquid accumulation cavity 214 and the flow channel of the Venturi tube body 3, the fluid in the venturi body 3 at the front end of the moving component 23 can be directly introduced into the liquid accumulation cavity 214 of the nose cone member 21 through the flow guide passage, so that the pressures at the two places are equal, thereby balancing the axial stress of the moving assembly 23 in the moving process, ensuring the stability of adjustment and the service life of corresponding parts, note that the main function of the nose cone member 21 is to replace the axially moving part such as the moving assembly 23 to resist the impact of the upstream fluid, to increase the stability of the axially moving part such as the moving assembly 23, and to avoid the large change of displacement, the change of the minimum flow cross-sectional area of the throat, and the strong fluctuation of the flow rate caused by the fluid impact on the axially moving part such as the moving assembly 23.

In one embodiment of the present application, preferably, as shown in fig. 3 and 4, a first limit balancing component is provided between the moving sleeve 22 and the inlet mounting housing 11, and a second limit balancing component is provided between the moving component 23 and the venturi body 3 for limiting the forward and backward movement of the moving component 23 in the moving direction.

Preferably, as shown in fig. 3 and 4, the first position-limiting balancing assembly includes a position-limiting member 24 and a first elastic member 25, the position-limiting member 24 is clamped in a partial structure of the nose cone member 21, the first elastic member 25 is sleeved on one end of the moving sleeve 22, and two opposite ends of the first elastic member 25 respectively abut against the position-limiting member 24 and a first position-limiting portion formed by the moving sleeve 22;

the second position-limiting balancing assembly includes a second elastic member 26, the second elastic member 26 is sleeved on the opposite end of the moving sleeve 22, and the opposite ends of the second elastic member 26 respectively abut against the venturi body 3 and a second position-limiting portion formed by the moving sleeve 22.

In this embodiment, the elastic force generated by the first elastic member 25 and the second elastic member 26 is balanced with the electromagnetic force received by the moving assembly 23 in the moving mechanism 2. Specifically, different currents are applied to the coil 13 to generate corresponding magnetic fields, and the moving components such as the moving assembly 23 and the like are subjected to corresponding electromagnetic forces, which require corresponding elastic forces to balance, in order to provide the corresponding elastic forces, the first elastic member 25 and the second elastic member 26 are forced to be displaced correspondingly during the left-right movement of the moving sleeve 22, so as to provide the elastic forces, and in addition, the operation also stops the moving components such as the moving assembly 23 and the like at a new position balance position, so that the throat portion, that is, the minimum flow cross-sectional area of the needle cone parallel section 322 and the needle cone member 232, which are described below, is changed, thereby changing the flow rate.

Note that, the larger the current applied to the coil 13, the larger the magnetic field strength of the electromagnetic field, the larger the electromagnetic force applied to the moving parts such as the moving assembly 23, the larger the elastic deformation of the corresponding first elastic member 25 and second elastic member 26, the larger the displacement amount of the moving parts such as the moving assembly 23, and the smaller the throat flow cross-sectional area at this time, the smaller the flow rate. When the current supplied to the coil 13 reaches a certain value, the amount of elastic deformation of the first elastic element 25 and the second elastic element 26 will not change, since the needle-cone element 232 of the moving assembly 23 is already in contact with the throat needle-cone parallel section 322 of the venturi body 3, at which the flow rate is 0.

Preferably, the first elastic member 25 and the second elastic member 26 are both springs having rectangular cross sections.

Preferably, the first and second limiting parts are formed as an integral annular step 221, that is, two opposite sides of the annular step 221 are used for limiting the first and second

elastic members

25 and 26, respectively, and play a role in transmitting force, and furthermore, the annular step 221 and the moving sleeve 22 can be of an integral structure.

In one embodiment of the present application, preferably, as shown in fig. 3 and 5, the moving assembly 23 includes a balance conducting member 231 and a needle cone member 232 which are connected, and a connecting member 233 is clamped between the balance conducting member 231 and the needle cone member 232, the connecting member 233 is further connected with the moving sleeve 22, and the connecting member 233 plays a role of connecting the moving sleeve 22 and the needle cone member 232, and can transmit force.

Stop member 24 is snapped onto nose cone member 21, i.e., stop member 24 is stopped by nose cone member 21.

The nose cone member 21 is formed with the hydrops cavity 214, the flow guide channel comprises a first flow guide channel 2312 and a second flow guide channel 2323 which are communicated, the first flow guide channel 2312 is formed on the balance conducting member 231, and the second flow guide channel 2323 is formed on the needle cone member 232; the liquid accumulation cavity 214, the first flow guide channel 2312 and the second flow guide channel 2323 are communicated in sequence, and liquid in the venturi body 3 can sequentially flow through the second flow guide channel 2323 and the first flow guide channel 2312 and finally enters the liquid accumulation cavity 214.

The balance conducting member 231 is inserted into the mounting cavity inside the nose cone member 21 and is connected with the nose cone member 21 in a sliding manner, so that the assembly structure is less prone to leakage;

the end of the balance conducting member 231 and the nose cone member 21 enclose a liquid accumulation cavity 214;

the dynamic seal member 27 is provided between the balance conduction member 231 and the nose cone member 21, and functions as a dynamic seal.

The balance conducting member 231, the connecting member 233 and the needle cone member 232 are preferably made of soft magnetic alloy such as 1J50, which is corrosion resistant and can be magnetized in electromagnetic field to receive large electromagnetic force in magnetic field.

In one embodiment of the present application, preferably, as shown in fig. 3 and 4, a first step groove is formed between the balance conducting member 231 and the needle cone member 232;

the connecting member 233 includes a connecting mounting ring portion 2331 and a connecting portion 2332, the mounting ring portion 2331 is sleeved outside the balance conducting member 231 and stably clamped in the first stepped groove;

the top of the connecting portion 2332 away from the mounting ring portion 2331 is connected to the inner wall of the movable sleeve 22, so that the connection between the movable assembly 23 and the movable sleeve 22 by the connecting member 233 is realized, and the assembly structure is more stable and is not easy to separate.

The connecting portion 2332 has a fin-shaped structure to transmit force, and at the same time, to improve flow conditions and reduce pressure transients, and wherein preferably the number of the connecting portions 2332 is plural, the plural connecting portions 2332 being uniformly arranged along the circumference of the mounting ring portion 2331.

In one embodiment of the present application, preferably, as shown in fig. 3 to 5, the nose cone member 21 includes a nose cone main body 211, a first auxiliary mounting portion 212, and a catching portion 213; the nose cone body 211 has a cylindrical shell structure with a conical head, and the conical head can reduce flow resistance and flow pressure loss; the first auxiliary mounting portion 212 also has a fin-like structure, which improves the flow condition, reduces the flow resistance, and reduces the flow pressure loss.

The first auxiliary mounting part 212 is arranged on the outer wall surface of the nose cone main body 211, the clamping part 213 is arranged on the top of the first auxiliary mounting part 212 far away from the nose cone main body 211, a second step groove is formed by the clamping part 213 and the first auxiliary mounting part 212, and the limiting member 24 is clamped in the second step groove;

the engagement portion 213 and the stopper member 24 are engaged between the inlet attachment housing 11 and the middle attachment housing 12, and fix the nose cone member 21 to be stationary.

In one embodiment of the present application, needle cone member 232 preferably includes a connected body 2321 and a variable 2322; the body 2321 is connected with the balance conduction member 231 through threads, and belongs to a detachable connection structure, so that operation and maintenance are facilitated;

the variable 2322 has a tapered structure tapering towards the venturi body 3 for varying the minimum flow cross-section in cooperation with the needle-tapered parallel section 322 of the venturi body 3.

In one embodiment of the present application, preferably, as shown in fig. 3, the venturi body 3 includes the venturi body 3 and the second static seal member 5; the venturi body 3 includes a mounting housing portion 31 and a flow guiding portion 32, the mounting housing portion 31 is connected to the middle mounting housing 12, and preferably, the mounting housing portion 31 has a cylindrical housing structure, and can be sleeved on one end of the middle mounting housing 12 far away from the inlet mounting housing 11 and connected by a thread;

the second static sealing component 5 is annular, and the second static sealing component 5 is arranged between the installation shell part 31 and the middle installation shell 12;

the flow guide portion 32 is formed with the above-mentioned flow passage, which includes a contraction section 321, a needle-cone parallel section 322, and an expansion section 323 arranged in sequence.

In this embodiment, the flow cross-sectional area of the constriction 321 of the flow channel is gradually reduced, so as to increase the fluid speed and reduce the fluid static pressure. The parallel section 322 of the needle cone of the flow channel is for better cavitation of the fluid, when the ratio of the downstream pressure to the upstream pressure is less than 0.85, the static pressure of the fluid at the minimum flow cross section of the throat part is saturated vapor pressure, cavitation can occur, and the needle cone member 232 and the parallel section 322 of the needle cone of the flow channel form the minimum flow cross section, thereby controlling the flow rate.

Because the needle cone component 232 is parallel to the needle cone parallel section 322 of the flow channel, the flow cross-sectional area of the fluid is approximately unchanged when the fluid passes through the needle cone parallel section 322 of the venturi body 3, the minimum cross-sectional area of the throat can not be a plane any more, but is an individual body, the gas quantity generated by the cavitation of the venturi can be increased, and the flow can be better stabilized.

The expanding section 323 of the flow channel reduces the fluid velocity and gradually restores the hydrostatic pressure of the fluid.

In one embodiment of the present application, the non-contact driven adjustable cavitation venturi further preferably comprises a controller and a flow sensor, the flow sensor is disposed on the pipeline connected to the venturi body 3, and the flow sensor and the coil 13 are both in communication connection with the controller (not shown in the figure).

It can be seen that, in order to further accurately control the flow, a flow sensor is added in the conveying system at the end of the venturi tube body 3 to obtain the magnitude of the real-time flow, the controller reads the numerical value of the flow sensor, compares the real-time flow with the target flow set by the controller, continuously adjusts the current of the coil 13 according to the deviation value obtained by the flow comparison, and changes the displacement of the valve core, thereby forming the flow closed-loop control and improving the flow control accuracy.

In summary, the structure of the components of the non-contact driven adjustable cavitation venturi is detailed as follows:

inlet mounting housing 11: the inlet mounting housing 11 may provide an interface to connect with upstream piping; inlet mounting housing 11 provides a recess to limit radial movement of nose cone member 21; the inlet mounting housing 11 is fitted to the middle mounting housing 12, and the inlet mounting housing and the middle mounting housing sandwich the engaging portion 213 for fixing the nose cone member 21 and the stopper member 24 such as a nose cone fixing ring; the inlet mounting shell 11 is connected with the middle mounting shell 12 through threads; the inlet mount housing 11 restricts axial displacement of the coil 13 by the end face; a second static sealing member 5 such as a packing is provided between the inlet mounting housing 11 and the middle mounting housing 12, thereby forming a sealing structure to prevent fluid leakage; the internal flow passage of the inlet mounting housing 11 is adapted to the external taper of the nose cone member 21 to form a gradually transitional flow passage, reducing flow resistance and pressure loss.

Nose cone member 21: the radial degree of freedom of the nose cone member 21 is defined by the inlet mounting housing 11 and the mid-mounting housing 12, the axial degree of freedom of the nose cone member 21 is defined by a stop member 24, such as a nose cone retaining ring; the interior of the nose cone member 21 is provided with a liquid accumulation cavity 214 for balancing the axial pressure of the needle cone member 232, so that the axial stress of the needle cone member 232 is balanced;

the specific method is that the head of the needle cone member 232 is perforated with a through hole which penetrates through the needle cone member 232 and the balance conducting member 231, the fluid at the head of the needle cone member 232 is directly led into the liquid accumulation cavity 214 of the head cone member 21, the head of the needle cone member 232 is communicated with the liquid accumulation cavity 214 of the head cone member 21, so that the pressure at the two positions is equal, and the axial stress of the needle cone member 232 and the balance conducting member 231 is balanced; the nose cone member 21 mainly functions to resist the impact of upstream fluid on the axial moving parts such as the needle cone member 232, increase the stability of the axial moving parts such as the needle cone member 232, and avoid the phenomenon that the displacement is greatly changed, the minimum flow cross section of the throat is changed, and the flow rate is strongly fluctuated because the axial moving parts such as the needle cone member 232 are impacted by the fluid; the head of the nose cone member 21 is tapered, and the three fixing ribs are fin-shaped, so that the flow condition can be improved, the flow resistance can be reduced, and the flow pressure loss can be reduced.

Balance conduction member 231: the balance conducting member 231 is partially wrapped inside the nose cone member 21 and is attached to the inner wall surface of the nose cone member 21 to limit the radial displacement of the needle cone member 232; a through hole is formed in the balance conducting member 231, and the head of the needle cone member 232 is communicated with the hydropneumatic chamber 214 of the nose cone member 21 for balancing pressure;

a second static sealing component 5 such as a sealing ring is arranged between the balance conducting component 231 and the nose cone component 21 to form sealing, so that the fluid of the hydropneumatic chamber 214 of the nose cone component 21 is prevented from being communicated with the fluid at the periphery of the nose cone component 21;

the balance conducting component 231 is connected with the needle cone component 232 through threads; the balance lead-through member 231 cooperates with the needle cone member 232 to limit axial displacement of the connecting member 233. The balance conducting component 231, the connecting component 233, the movable sleeve 22 and the needle cone component 232 are fixedly connected together and are all made of soft magnetic alloy such as 1J50, magnetization can be generated under the action of a magnetic field, then the magnetic field acting force is applied, the final magnetic field acting force is balanced with the elastic force of the first elastic component 25 and the second elastic component 26, the magnetic field is changed, the needle cone component 232 is axially displaced, the minimum flow cross section area of the throat is changed, and the flow is changed.

Stop member 24 such as a nose cone retainer ring: stop member 24 is intended to limit the axial displacement of fixed nose cone member 21. Nose cone member 21 is restrained from movement by inlet mounting housing 11 and intermediate mounting housing 12.

First static seal member 4 such as a seal ring: a first static sealing member 4 is provided between the inlet mounting case 11 and the middle mounting case 12 to form a sealing structure to prevent fluid leakage.

Mid-mount housing 12: the middle mounting shell 12 is respectively in threaded connection with the inlet mounting shell 11 and the venturi body 3; the mid-mount housing 12 cooperates with the inlet mount housing 11, the venturi body 3, to limit the movement of the coil 13, while also limiting the radial displacement of the first and second

resilient members

25, 26.

First elastic member 25 and second elastic member 26: the elastic force generated by the first elastic member 25 and the second elastic member 26 is balanced with the electromagnetic force applied to the moving parts such as the needle cone member 232. Different currents are introduced into the coil 13 to generate corresponding magnetic fields, and the needle cone member 232 and other moving parts are subjected to corresponding electromagnetic forces, so that corresponding elastic force balance is required. In order to provide corresponding elastic force, the first elastic member 25 and the second elastic member 26 are forced to displace correspondingly, the moving parts such as the needle cone member 232 and the like are balanced at a new position, and the minimum flow cross-sectional area of the throat is changed, so that the flow is changed.

Coil 13: the coil 13 functions to generate an electromagnetic field by which a moving member such as the needle cone member 232 receives an electromagnetic force to be displaced. The larger the current is applied to the coil 13, the larger the magnetic field intensity of the electromagnetic field is, the larger the electromagnetic force applied to the moving parts such as the needle cone member 232 is, the larger the elastic deformation of the corresponding first elastic member 25 and second elastic member 26 is, the larger the displacement amount of the moving parts such as the needle cone member 232 is, and the smaller the flow rate is, the smaller the flow cross-sectional area of the throat portion at that time is. When the current is applied to the coil 13 to a certain value, the amount of elastic deformation of the first elastic member 25 and the second elastic member 26 will not change, because the needle-cone member 232 is already in contact with the needle-cone parallel section 322 of the venturi body 3, i.e. the throat, and the flow rate is 0.

Plug-and-socket 14: the plug socket 14 is an interface for supplying current to the coil 13.

Moving the sleeve 22: the intermediate portion of the moving sleeve 22 is provided with an annular step 221, and both step surfaces of the annular step 221 are in contact with the first elastic member 25 and the second elastic member 26, respectively, to function as a transmission force. The moving sleeve 22 is fixedly connected with three fin-shaped ribs of the connecting member 233 by welding, and the moving sleeve 22 and the moving parts such as the needle cone member 232 are subjected to electromagnetic force together to perform axial movement. The moving sleeve 22 is restricted in radial displacement by the first elastic member 25 and the second elastic member 26.

The connecting member 233: the connecting member 233 serves to connect the traveling sleeve 22 and the needle cone member 232; the connecting member 233 has three fin-shaped ribs, which can transmit force, improve flow conditions, and reduce pressure transients; the connecting member 233 and the needle-cone member 232 are made of soft magnetic alloy such as 1J50, which is corrosion resistant and can be magnetized in the electromagnetic field to receive large electromagnetic force in the magnetic field.

Needle cone member 232: the needle cone member 232 and the balance conduction member 231 are connected through threads, and the needle cone member 232 can be located at different positions by changing the current in the coil 13, so that the minimum flow cross-sectional area of the throat part is changed, and the purpose of adjusting the flow is achieved.

First static seal member 4 such as a seal ring: its function is to prevent fluid leakage.

A venturi body 3: the flow passage of the venturi body 3 has three parts of a constricted section 321, a needle-cone parallel section 322 and an expanded section 323. The flow cross-sectional area of the visible flow channel of the contraction section 321 is gradually reduced, so that the fluid speed can be increased, and the hydrostatic pressure can be reduced. The needle cone parallel section 322 is for better cavitation of the fluid, when the ratio of the downstream pressure to the upstream pressure is less than 0.85, the static pressure of the fluid at the minimum flow cross section of the throat part is saturated vapor pressure, cavitation can occur, and the needle cone member 232 and the needle cone parallel section 322 of the venturi housing form the minimum flow cross section, thereby controlling the flow rate. Because the needle cone component 232 is parallel to the needle cone parallel section 322 of the venturi body 3, the flow cross-sectional area of the fluid is approximately unchanged when the fluid passes through the needle cone parallel section 322 of the venturi body 3, the minimum cross-sectional area of the throat part can not be a plane any more, but is an individual body, the gas quantity generated by the cavitation of the venturi can be increased, and the flow can be better stabilized. The diverging section 323 of the venturi body 3 is designed to reduce the velocity of the fluid and gradually restore the hydrostatic pressure of the fluid.

In conjunction with the above structure, the detailed process in which the needle-cone member 232 is driven is as follows:

the needle cone member 232 is driven as follows:

firstly, generating electromagnetism: the coil 13 is energized to generate an electromagnetic field.

Secondly, generating electromagnetic action: the movable sleeve 22 and the movable assembly 23 specifically include a balance conducting member 231, a connecting member 233 and a nose cone member 21 which are fixedly connected together and axially movable together, and are made of soft magnetic alloy such as 1J50, and are magnetized by a magnetic field and then axially movable by an electromagnetic force.

Thirdly, force transmission: the moving sleeve 22 and the moving assembly 23 are subjected to an electromagnetic force, which is transmitted to the first elastic member 25 and the second elastic member 26 through the moving sleeve 22.

Fourth, force balance: when the first elastic member 25 is elongated and the second elastic member 26 is compressed, the two will be elastically deformed, and an elastic force is generated, which will be balanced with the electromagnetic force, and after the balance, the needle cone member 232 will not move.

Fifth, the displacement of the needle cone member 232. By changing the current of the coil 13 and the electromagnetic force applied to the movable sleeve 22 and the movable assembly 23, the first elastic member 25 and the second elastic member 26 will undergo different elastic deformations to balance the electromagnetic force, which corresponds to different valve openings. The final corresponding relationship is: different currents correspond to different displacements of the needle-cone member 232, different minimum flow cross-sectional areas, different valve openings, and different flows, in short, different currents correspond to different flows.

The flow control process is as follows:

first, the coil 13 is powered on, the controller supplies the maximum rated current to the coil 13, at which time the current is maximum, and the needle-cone member 232 contacts the needle-cone parallel section 322 of the venturi body 3, at which time the flow rate is 0.

Secondly, the controller obtains the real-time flow through the flow sensor.

Thirdly, the controller sets a target flow, compares the target flow with the real-time flow to obtain a deviation value, and controls current output by using the flow deviation value of the real-time flow and the target flow. When the real-time flow is smaller than the target flow, the flow deviation value is smaller than 0, the current of the coil 13 is gradually reduced, and the opening of the valve is gradually increased until the target flow is equal to the real-time flow;

when the real-time flow is equal to the target flow, the flow deviation value is 0, the controller maintains the current of the coil 13 unchanged, and the opening of the valve is unchanged;

when the real-time flow is larger than the target flow, the flow deviation value is larger than 0, the current of the coil 13 is gradually increased, and the opening degree of the valve is reduced until the target flow is equal to the real-time flow.

As can be seen from the above description, the non-contact driven adjustable cavitation venturi has the following advantages:

firstly, the moving assembly 23, namely the valve core, is driven to move by the coil 13, and the valve core belongs to a non-contact driving mode, moving parts such as a needle cone member 232 are driven by the high-voltage direct-current resistant proportional electromagnetic coil 13, and due to non-contact, the contact-type driven dynamic seal in the prior art is abandoned, the sealing performance is greatly improved, and the risk of fluid leakage is reduced.

Secondly, by opening the needle cone member 232 and the balance conducting member 231, the fluid at the head of the needle cone member 232 is directly introduced into the hydrops cavity 214 of the nose cone member 21, and the axial stress of the moving parts such as the needle cone member 232 is balanced.

Thirdly, the nose cone member 21 is fixed and can replace the nose cone member 21 to resist the upstream fluid impact, and the impact on the moving parts such as the needle cone member 232 can be avoided. Meanwhile, the conical head and the fin-shaped rib of the nose cone member 21 and the fin-shaped rib of the connecting member 233 are structurally arranged to effectively improve the flow condition, reduce the fluid resistance and reduce the pressure damage.

Fourthly, closed-loop control of flow: the current of the coil 13 is changed in real time through the deviation of the real-time flow and the target flow, the flow is dynamically adjusted, and the flow control precision is improved.

Fifth, the non-contact driven adjustable cavitation venturi employs a corner-free mounting structure, which facilitates assembly and fluid flow.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A non-contact driven adjustable cavitation venturi, comprising: the driving coil assembly, the moving mechanism and the venturi body; wherein, the venturi body is formed with a flow passage with variable sectional area;

the driving coil assembly is provided with a circulation channel communicated with the venturi body and an external installation cavity; the moving mechanism is arranged in the mounting cavity, and part of the moving mechanism can be driven by the driving coil assembly to move along the flow passage of the venturi body so as to change the cross-sectional flow area;

the moving assembly is in sliding connection with the nose cone member;

2. The non-contact driven adjustable cavitation venturi of claim 1, wherein a second static sealing member is provided between one end of the mid-mount housing and the inlet mount housing, and the first static sealing member is provided between the opposite end of the mid-mount housing and the venturi body.

3. The non-contact driven adjustable cavitation venturi of claim 1, wherein opposite ends of the mid-mounting housing are respectively threadedly connected to the inlet-mounting housings and the venturi body in one-to-one correspondence.

4. The non-contact driven adjustable cavitation venturi of claim 1, wherein a dynamic sealing member is disposed between the moving assembly and the nose cone member.

5. The non-contact driven adjustable cavitation venturi of claim 4, wherein a first limit balance member is provided between the moving sleeve and the inlet mounting housing, and a second limit balance member is provided between the moving member and the venturi body for limiting the moving member in the moving direction.

6. The non-contact driven adjustable cavitation venturi according to claim 5, wherein the first position-limiting balancing component includes a position-limiting member and a first elastic member, the position-limiting member is clamped on a partial structure of the nose cone member, the first elastic member is sleeved on one end of the moving sleeve, and two opposite ends of the first elastic member respectively abut against the position-limiting member and a first position-limiting portion formed by the moving sleeve;

7. The non-contact driven adjustable cavitation venturi according to claim 6, wherein the moving assembly includes a balance conducting member and a needle cone member connected, and a connecting member is clamped between the balance conducting member and the needle cone member, the connecting member is further connected with the moving sleeve; the limiting component is clamped on the nose cone component;

the head cone component is provided with the hydropathy cavity, the flow guide channel comprises a first flow guide channel and a second flow guide channel which are communicated, the first flow guide channel is formed on the balance conduction component, and the second flow guide channel is formed on the needle cone component; the dropsy cavity, the first flow guide channel and the second flow guide channel are communicated in sequence;

8. The non-contact driven adjustable cavitation venturi according to claim 7, characterized in that a first step groove is formed between the equilibrium lead-through member and the needle cone member;

the connecting portion has a fin-like structure.

9. The non-contact driven adjustable cavitation venturi of claim 7, wherein the nose cone member includes a nose cone body, a first auxiliary mount portion and a snap portion; the nose cone main body is provided with a cylindrical shell structure with a conical head; the first auxiliary mounting part is provided with a fin-shaped structure;

the flow channel of the inlet mounting shell for accommodating the nose cone component is matched with the appearance of the nose cone component;

and/or

10. The non-contact driven adjustable cavitation venturi of claim 4, wherein the nose cone member and the moving assembly are formed of soft magnetic alloy.

11. The non-contact driven adjustable cavitation venturi according to any one of claims 2 to 10, further comprising a controller and a flow sensor, the flow sensor being disposed on a pipe to which the venturi body is connected, and the flow sensor and the coil being communicatively connected to the controller.

12. The non-contact driven adjustable cavitation venturi of any one of claims 2 to 10, wherein the venturi body includes a mounting housing portion and a flow guiding portion, the mounting housing portion being connected with the mid-mounting housing;